Polyisocyanurate (ISOCY)
Polyisocyanurate features a closed cell iso core integrally laminated to fiber reinforced felt facers. Iso has a perforated facer on one side for use with hot asphalt applied systems. The non-perforated side is for use with single-ply systems. Iso also comes in flat and tapered boards.
The major manufacturers of polyisocyanurate are Atlas Roofing Products, and Johns Manville.
A. H. Bennett Company stocks the following sizes:
1", 1.5", 2", 2.5", 2.7" and 3". Other sizes are available by special order.
Here is a view of a tapered insulation system.
